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Worked on a farm rewire in the late 80's, had loads of thos in the barns complete with bare conductors hanging off ceramic blocks for the lighting. Fantastic stuff!
Skipped them?
Spose on a different level...........if your gonna skip them then atleast extract the copper within them and recycle it.
Was 20 odd years ago mate and I was apprentice, no idea what happened to them.
I agree with rocker on this one. Bag it first, dont care how much of the stuff is in it. Any more than a few little pieces I would not touch with a barge pole, get an expert in.